Like mystics here on Earth, the Na'Vi have an experience of unity of consciousness with other beings, all of which (themselves included) are really just manifestations of one Being, which they call Ai'wa.

Ai is China's leading artist, one of the most remarkable in the world, and on Tuesday, his work arrives for the first time in Britain, perhaps the most awaited event yet to be unveiled in Tate Modern's Turbine Hall.